Abutment



FIG. 1 is a top perspective view of the abutment according to the claimed design;

FIG. 2 is a bottom perspective view of the abutment according to the claimed design;

FIG. 3 is a front view of the abutment according to the claimed design;

FIG. 4 is a top view of the abutment according to the claimed design; and,

FIG. 5 is a bottom view of the abutment according to the claimed design. 

The ornamental design for an abutment, as shown and described. 